Entropion is when the eyelid turns in, causing the eyelashes to rub against the surface of the eye. This leads to eye irritation, redness, and decreased vision due to erosions of the cornea from the eyelashes rubbing against the cornea. If it is left untreated, permanent scarring of the cornea and vision loss may occur. Entropion can be repair by a number of different procedures, depending on its cause, which ranges from laxity of the eyelid and eyelid muscle from aging to conjunctival shortening from chronic inflammation and scaring of the conjunctiva (the membrane on the back side of the eyelid). For laxity of eyelid and eyelid muscle, the eyelid may be tightened to the orbital rim with a suture through a small incision at the lateral canthus (the outside corner of the eye) and the muscle reattached to its insertion site with sutures. If there is conjunctival shortening, an incision is made in the conjunctiva and multiple sutures are placed in the eyelid to relax and rotate the eyelid margin forward, respectively. In some cases a graft is placed in the conjunctiva to lengthen this surface.